The only cock I've ever sucked was my own, and I've nutted in my mouth a few times. It was fucking delicious. I suppose if it tasted like her ass and pussy I'd probably suck someone off in front of her so she could watch me take their load in my mouth. We've talked about it a few times in the heat of the moment while fucking but it's never happened. I don't know how she'd feel about seeing me get my mouth fucked by someone's big dick, she might get off on it.